Synthesis and corrosion behavior of a hybrid bioceramic-biopolymer coating on biodegradable Mg alloy for orthopaedic implants

A composite coating composed of octacalcium phosphate (OCP) and hydroxyapatite (HA) as an underlayer and polycaprolactone (PCL) as an overlayer was fabricated on an Mg–1.2Ca–2Zn alloy via combination of chemical solution deposition and dip coating methods. The overlayer was composed of a pore networ...

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Bibliographic Details
Published in:Journal of alloys and compounds 2015-11, Vol.648, p.1067-1071
Main Authors: Bakhsheshi-Rad, H.R., Hamzah, E., Ismail, A.F., Sharer, Z., Abdul-Kadir, M.R., Daroonparvar, M., Saud, Safaa N., Medraj, M.
Format: Article
Language:English
Subjects:
Alloys
Biodegradable
Composite coatings
Corrosion
Current density
Hydroxyapatite
Magnesium
Magnesium base alloys
Octacalcium phosphate
Orthopaedic implants
Polycaprolactone
Thickness
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Summary:A composite coating composed of octacalcium phosphate (OCP) and hydroxyapatite (HA) as an underlayer and polycaprolactone (PCL) as an overlayer was fabricated on an Mg–1.2Ca–2Zn alloy via combination of chemical solution deposition and dip coating methods. The overlayer was composed of a pore network structure with thickness around 38 μm but the underlayer consisted of plate-like crystals with inner dense layer (1.2 μm) and an outer coarse layer (6 μm). The corrosion current densities of Mg alloy significantly decreased after composite coating from 211.6 to 0.059 μA/cm2. Hence, the PCL/OCP/HA composite coating can effectively protect the Mg–1.2Ca–2Zn alloy when used as degradable orthopaedic implants.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2015.07.075